Naslov
Deeply virtual Compton scattering beyond next-to- leading order : The flavor singlet case

Autori
Kumerički, Krešimir ; Müller, Dieter ; Passek- Kumerički, Kornelija ; Schäfer, Andreas

Izvornik
Physics letters. B (0370-2693) 648 (2007), 2/3; 186-194

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
deeply virtual compton scattering; next-to-next-to-leading order corrections; conformal symmetry

Sažetak
We study radiative corrections to deeply virtual Compton scattering in the kinematics of HERA collider experiments to next-to-leading and next- to-next-to-leading order. In the latter case the radiative corrections are evaluated in a special scheme that allows us to employ the predictive power of conformal symmetry. As observed before, the size of next-to-leading order corrections strongly depends on the gluonic input, as gluons start to contribute at this order. Beyond next-to- leading order we find, in contrast, that the corrections for an input scale of few GeV^2 are small enough to justify the uses of perturbation theory. For xi>=5x10^(-3) the modification of the scale dependence is also small. However, with decreasing xi it becomes moderate or even large.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
[hep-ph/0605237]

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